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NAT技术在防火墙中的应用 总被引:2,自引:0,他引:2
网络地址转换(NAT)技术使内部网无需重分IP地址,减少ISP帐号花费以及提供完善的负载平衡功能,主要介绍了网络地坦转换技术的模式,原理及其在防火墙的应用。 相似文献
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快速频道切换是一种减少IPTV切台时间的技术。运营商广泛应用的IPTV频道快速切换标准都要求机顶盒与频道快速切台系统可以实现路由可达。然而,在采用全路由模式的家庭网关场景下,机顶盒IP地址会经过网络地址转换(NAT),无法实现与频道快速切台系统的路由可达。本文提出了一种在网络地址转换后实现IPTV频道快速切换功能的方案,并在广东省广播电视网络股份有限公司经过实践应用验证,效果良好。 相似文献
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本文详细介绍了网络地址转换技术(NAT)的原理及它的应用领域,并结合Linux操作系统给出了实例分析。最后对网络地址转换技术进行了总结评价。 相似文献
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我们可以把整个因特网看作是一个单一的、抽象的网络,IP地址是用来标识这个网络上计算机的逻辑地址,这个网络也依靠IP地址与本网上的其它站点互相区分、互相通信。然而在实际通信过程中,仅有IP地址是不够的,还必须借助硬件地址,那么IP地址与硬件地址是如何配合通信的呢?本文通过一个实例来揭示它们之间的配合关系。 相似文献
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面对各种各样的以太网接口设计,为了寻求一种简单而有效地网络接口,现在给出了一种基于ENC28J60的接口网络设计。ENC28J60符合IEEE802.3协议,不仅能提供以太网通信的相应功能,而且体积小,可以设计出较小的嵌入式网关。文中参照传输控制协议/网际协议,设计了基于ENC28J60和单片机的网关的硬件设计与软件设计,实现了通过Inetnet与单片机的通信。分析表明:基于单片机和ENC28J60的网络接口具有接口简单,开发方便,成本低,十分适用于嵌入式系统,特别是基于嵌入式的智能家居控制系统的应用。 相似文献
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Active networks for efficient distributed network management 总被引:12,自引:0,他引:12
《Communications Magazine, IEEE》2000,38(3):138-143
The emerging next generation of routers exhibit both high performance and rich functionality, such as support for virtual private networks and QoS. To achieve this, per-flow queuing and fast IP filtering are incorporated into the router hardware. The management of a network comprising such devices and efficient use of the new functionality introduce new challenges. A truly distributed network management system is an attractive candidate to address these challenges. We describe how active network techniques can be used to allow fast and easy deployment of distributed network management applications in IP networks. We describe a prototype system where legacy routers are enhanced with an adjunct active engine, which enables the safe execution and rapid deployment of new distributed management applications in the network layer. This system can gradually be integrated in today's IP network, and allows smooth migration from IP to programmable networks. This is done with an emphasis on efficient use of network resources, which is somewhat obscure by many of today's high-level solutions 相似文献
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高清晰度多媒体接口(High-Definition Multimedia Interface,HDMI)显示接口是嵌入式实现的视频采集及处理系统的重要组成部分,并有逐渐成为此类系统的显示端标准接口的趋势.然而在ZYNQ平台中由于没有在芯片中集成HDMI控制器,所以普遍采用模拟视频信号显示,限制了处理效果的展示和人机之间的交互.采用ADI的开源HDMI IP核以及Xilinx提供的相关IP核结合ADI HDMI发送器ADV7511,在ZYNQ平台上以软硬件协同的工作方式设计实现了HDMI显示端.方案分别基于无操作系统和Linux操作系统环境实现,其中无操作系统实现可以被移植用于一些特定场合或供硬件系统测试使用;而在Linux操作系统下,通过结合直接渲染管理器(Direct Rendering Manager,DRM),本方案可以方便Linux系统下该显示系统的移植与集成. 相似文献
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蓄电池巡检仪能同时对蓄电池组各节电池进行实时监控,全面获取蓄电池状态信息.系统地阐述了一种基于TCP/IP通信的嵌入式智能蓄电池巡检系统的设计,该巡检系统的上位机是基于LabVIEW软件开发的人机交换界面,下位机采用嵌入式uClinux操作系统,上下位机通过以太网通讯.重点介绍了整个系统的结构、检测原理、硬件电路和开发流程. 相似文献
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公网地址短缺是网络通信中普遍存在的一个问题.结合SIP系统的特点,分析了采用特定域IP(RSIP)协议技术实现私网穿越的解决方案,并介绍了RSIP工作机制及对应用层SIP消息中路由地址和IP层报头地址翻译的原理. 相似文献
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为了实现中小场合对于视频监控设备的低成本和网络化的需求,设计了一种基于ARM-S3C2410、音视频硬件编解码芯片AT2042的嵌入式网络视频监控系统,该监控系统实现了MPEG-4编解码器,能实现本地的海量存储、远程控制以及运动检测的功能。用户通过在个人计算机(PC)端输入网页服务器的因特网协议(IP)地址来访问服务器,下载安装ActiveX控件,远程监控实现需要的控制。 相似文献
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The demand assigned capacity management (DACM) problem in IP over optical (IPO) network aims at devising efficient bandwidth replenishment schedules from the optical domain conditioned upon traffic evolution processes in the IP domain. A replenishment schedule specifies the location, sizing, and sequencing of link capacity expansions to support the growth of Internet traffic demand in the IP network subject to economic considerations. A major distinction in the approach presented in this paper is the focus of attention on the economics of "excess bandwidth" in the IP domain, which can be viewed as an inventory system that is endowed with fixed and variable costs and depletes with increase in IP traffic demand requiring replenishment from the optical domain. We develop mathematical models to address the DACM problem in IPO networks based on a class of inventory management replenishment methods. We apply the technique to IPO networks that implement capacity adaptive routing in the IP domain and networks without capacity adaptive routing. We analyze the performance characteristics under both scenarios, in terms of minimizing cumulative replenishment cost over an interval of time. For the non-capacity adaptive routing scenario, we consider a shortest path approach in the IP domain, specifically OSPF. For the capacity adaptive scenario, we use an online constraint-based routing scheme. This study represents an application of integrated traffic engineering which concerns collaborative decision making targeted towards network performance improvement that takes into consideration traffic demands, control capabilities, and network assets at different levels in the network hierarchy. 相似文献